These professional quality Latex rubber molds can be used to make literally hundreds of Tyrannosaurus Rex tooth fossil replicas or choose one of our other fossil replica molds. Simply use a rubber band to hold the two halves of the mold together, pour in some plaster of Paris (or even better, our PerfectCast casting medium) and in about 30 minutes your students will have a perfect fossil replica of a tooth from the most famous carnivore of all times! The finished casting may be painted or polished with shoe polish to give it a completely realistic look. Our molds are durable and use only a few cents in casting medium per mold. This is the best way to let your students take home a piece of history. Instructions included!
In addition to the Tyrannosaurus Rex Tooth Molds, Educational Innovations also offers other 2-piece, 3-dimensional fossil molds. As with the T-Rex, each mold consists of two separate halves which are held together with rubber bands during the casting process. Each mold has been created from a real fossil and is totally authentic. Your students will love them all!
Download the pdf of this lesson!
- Rubber seam line mold (2 halves)
- Rubber bands
- Casting medium (PerfectCast #FSL-310 or Plaster of Paris)
- Tablespoon or measuring spoons
- Mixing container (paper or plastic cups work well)
- Mixing utensil (popsicle stick or spoon)
- Nail file (optional)
- Fit the two pieces of the mold together in the correct position and secure the two halves together with rubber bands.
- Into a disposable cup or container, measure approximately 2.5 tablespoons of cool water. Add 6
tablespoons of casting medium. (Please refer to the instructions for the casting medium for exact
measurements.) Immediately stir until the mixture is evenly mixed and smooth (~1/2 minutes). Tap the
cup on the table a few times to bring any bubbles in the mixture to the surface.
- Fill the mold through the small hole to the top with the casting mixture. Tap the mold lightly on a table, tilting it in all directions to dislodge any air bubbles from the sides of the mold and bring them to the top of the mixture. Do not pour any extra casting mixture down the drain! The extra plaster and the cup should be thrown in the trash. Wash the mixing utensil and measuring spoon before the mixture hardens.
- Let the filled mold sit undisturbed for at least 30 minutes, or until the cast is warm and hard. After the mixture hardens, carefully separate the sides of the mold and very carefully remove the cast. (Note that the plaster has not fully dried, and may still be slightly soft.)
- Carefully break off the funnel-shaped projection (spur) from the top of the cast. File away any seam
lines from where the mold came together. Let your fossil replica dry completely before finishing.
- To finish your fossil replica, paint or stain it with earth tones (browns or black). We have found that
brown shoe polish works extremely well. Simply rub on a heavy coat with a cloth, then rub off. Buffing
afterwards will bring out a slight shine and give the appearance of natural weathered bone. You may
also try staining your fossil with dark colored wood stains or even tea.
Write a review
Dec 12, 2015 | By Julia of Lincoln, NE United States
Dec 17, 2014 | By Bob Martin of Placitas, NM United States
Geology camp hit!
Jul 29, 2012 | By Michelle Peterson of Mobile, AL United States
May 21, 2012 | By Kathy Wolfram of Amarillo, TX United States
Awesome great piece mold looks awesome
May 20, 2012 | By Kevin of West Bloomfield, MI United States
Awesome simple use
May 7, 2012 | By Kevin of West Bloomfield, MI United States
Students can use the Tooth and Claw molds as part of an investigation to gather information and evidence to support claims for early life in the Geologic History of Earth.
Students can use the Tooth and Claw molds and plaster to make their own fossil reproductions. This will allow students to manipulate the body part to make predictions about the animal.
* NGSS is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of, and do not endorse, this product.